The block diagram here:
500 MB/s each x1
But, is this speed for one direction only, or
for both directions combined?
In other words, if I install an x1 PCIe 2.0 RAID controller e.g.
is the maximum upstream bandwidth limited to 250 MB/s
even though each SATA channel is rated at 300 MB/s?
It would help if the chipset block diagram indicated
the PCI-Express Generation for the x1 slot.
The block diagram does indicate PCI Express 1.1 for the x16 slot.
If the x1 slot is also PCI Express 1.1, THEN the one-way
bandwidth of that x1 slot is 250 MB/second, correct?
Please confirm or correct the above.
RSVP and ... THANKS!
Yes, in PCI-E 1.x versions each lane have 250 MB/s speed for each direction, 500 combined.
For SATA channels 300 MB/s - such speeds per channel on regular basis are reachable only with premium-class SSDs. For traditional HDDs even an enterprise 15K rpm models is practically capable for about 100-120 MB/s sustained rate at best - so dual-channel controller without dedicated memory buffer is not bus speed limited.